Analog Devices Inc. AD7495AR-REEL

Overview

AD7495AR-REEL from Analog Devices is a 12-bit, 1 MSPS successive-approximation ADC with integrated 2.5 V reference, single-supply operation (2.7 V to 5.25 V), SPI-compatible serial interface, and 68 dB SINAD at 300 kHz input. It serves as a high-speed analog front-end in portable data acquisition systems requiring low power and compact layout.

For engineers reviewing the AD7495AR-REEL datasheet, AD7495AR-REEL pinout, AD7495AR-REEL application, or AD7495AR-REEL equivalent, key selection criteria include on-chip reference accuracy (±1.5% over temperature), VDRIVE logic-level independence, 1 µA full shutdown current, and guaranteed no-missed-codes performance across −40°C to +85°C.

Technical Context

The AD7495AR-REEL implements a capacitive DAC-based successive-approximation architecture with track-and-hold acquisition time ≤325 ns for full-scale steps and aperture jitter of 50 ps typ. Conversion is initiated by CS falling edge and clocked by SCLK, with no pipeline delay and deterministic 16-cycle timing (800 ns max at 20 MHz).

It features dual supply domains: VDD powers analog and core logic (2.7–5.25 V), while VDRIVE sets I/O voltage levels independently (2.7–5.25 V), enabling direct interfacing to 3 V or 5 V processors without level shifters. The internal 2.5 V reference provides REF OUT with 50 ppm/°C tempco and 10 Ω output impedance.

Key Specifications

Pinout & Package

AD7495AR-REEL is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), optimized for space-constrained PCB layouts in portable instrumentation and medical devices.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with AD7475AR-REEL, AD7495AR-REEL trades slightly higher active power for reference integration and simplified layout; versus ADS7822U, it delivers 2 extra bits of resolution and guaranteed monotonicity-critical for closed-loop control and medical diagnostics.

Availability

AD7495AR-REEL is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, and industrial data acquisition requiring stable component supply and long-term manufacturability.

Supply support for AD7495AR-REEL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The AD7495AR-REEL belongs to the AD7475/AD7495 family of micropower SAR ADCs designed specifically for space- and energy-constrained applications demanding high throughput without sacrificing DC accuracy or dynamic performance.

FAQ

What is the reference voltage accuracy and temperature stability of the AD7495AR-REEL?

The AD7495AR-REEL features an on-chip 2.5 V reference with initial accuracy of ±1.5% and a temperature coefficient of 50 ppm/°C typ. This specification ensures stable full-scale calibration across the operating range of −40°C to +85°C without requiring external trimming. The REF OUT pin delivers this reference with 10 Ω output impedance and requires ≥100 nF ceramic decoupling capacitance to GND for optimal noise performance and regulation stability in the AD7495AR-REEL.

Does the AD7495AR-REEL support true 1 MSPS continuous conversion?

Yes, the AD7495AR-REEL achieves a guaranteed 1 MSPS throughput rate when operated with a 20 MHz SCLK and proper timing margins. Its conversion time is fixed at 16 SCLK cycles (800 ns max), and the minimum quiet time between conversions is 100 ns. With appropriate CS pulse timing and SCLK duty cycle (40/60 to 60/40), the device sustains continuous 1 MSPS sampling without pipeline delay or dropped samples in the AD7495AR-REEL.

Can the AD7495AR-REEL interface directly with a 3.3 V microcontroller while powered from a 5 V supply?

Yes, the AD7495AR-REEL supports mixed-voltage operation via its dedicated VDRIVE pin. When VDD = 5 V and VDRIVE = 3.3 V, the digital interface (CS, SCLK, SDATA) operates at 3.3 V logic levels, enabling direct connection to 3.3 V microcontrollers without level shifters. Input thresholds scale with VDRIVE (e.g., VINH = VDRIVE − 1 V), and output drive strength remains compliant per SPI specifications in the AD7495AR-REEL.

What is the guaranteed differential nonlinearity (DNL) specification for the AD7495AR-REEL?

The AD7495AR-REEL guarantees a differential nonlinearity (DNL) of +1.5/−0.9 LSB max over temperature and supply range, ensuring no missing codes across the full 12-bit transfer function. This monotonicity guarantee is critical for closed-loop control and real-time waveform reconstruction applications. At 25°C, typical DNL is ±0.6 LSB, supporting high-fidelity signal capture in the AD7495AR-REEL.

How does the power consumption of the AD7495AR-REEL scale with throughput rate?

The AD7495AR-REEL offers three programmable power modes: normal (2 mA @ 3 V, 1 MSPS), partial power-down (650 µA @ 100 kSPS), and full shutdown (1 µA). Power scales nearly linearly with throughput in normal mode due to clock-driven logic activity, while partial and full modes reduce quiescent current independent of SCLK frequency. This enables adaptive power management in burst-mode acquisition systems using the AD7495AR-REEL.